a person who is considered "popular" in school community, generally for several reasons: they are a skank, their mates are skanks, they are hot, their mates are hot, they are funny, they wear cool clothes and tend to set a trend followed by their peers, they listen to cool music, they have a piercing etc. populoids are at the top of a layered structure within a school community; they look down on anybody below them. a stereotypical populoid is bitchy, two-faced, nice-to-your-face, slutty, pretty and doesn't put in much effort in school. populoids also often use the intelligent students for homework help.
populoid (to geek): "hey man, ain't spoken to u for a while. wow last night's party was awesome... i didn't get the homework done though. do u think i could copy yours?"
geek: (thinking the populoid is their friend) "yeah sure course you can, i dont mind"